Go here:
   http://www.rotaryaviation.com/eficont.html

   Scroll down until you see these words:

   "Planning to use the EC3?  We get a lot of requests about the number
   of wires needed for the EC3 and other installation details. If you'd
   like to get a better idea of how to prepare for and install the EC3,
   please CLICK HERE"

   Click on "CLICK HERE"

   and download "EC2AinstallRev2.pdf"

   Read the pdf. There will be a quiz later.
   Those passing the quiz will get a honorary degree in computer
   science from the ACRE :)

   Paul Lamar

Is that your 'sense of humor' we're seeing, poking fun at the complexity
of the EC2?

What if I already have a computer sci degree?
IMHO, a 555 timer; although it may actually keep the engine running;
will be FAR from acceptable when actually installed and flying.
But I'm just a lifetime mechanic and a professional programmer, not an
engineer.

The EC2 uses the PIC 18 series micro controller; programming it
is surprisingly simple (if you understand programming and electronics)
and allows for a lot of flexibility.
(Been there done that)

brian g

Well then you should get an A :)

If you have read the ACRE web site you might find that I probably
designed,  built and coded in hex, the very first embedded
application of a micro processor back in 1975. It was hardware
interrupt driven real time multi tasking with 22 applications. No
cross assembler. In fact no assembler of any kind. No PC to help!!!
Hex key pad machine code !!!! Six 7 segment LED's.  Four for address
and two for hex instructions.

A few Phd's at Los Alamos Labs like it so much they coauthored
with me an IEEE paper on the system:

---------------------------------------------------------
Microprocessor-Based System for Roll-Down and Acceleration Tests
by D.K. Lynn, C.R. Derouin, and Paul Lamar
Los Alamos Scientific Laboratory
Published in IEEE Proceedings 29th Vehicular Technology Conference
(The technical details of the Lamar Instruments road test system.)
Arlington, Illinois, March 28-30, 1979
-------------------------------------------------------

We sold these systems to just about every car and motorcycle
manufacturer in the world. I also used it to help develop turbo
chargers at Garret for  turbo charged Fords.

------------------------------------------------------
The Effects of Turbocharger Design and Installation on
Gasoline Vehicle Transient Response.
David Elpern. Garrett Automotive Products Co.
SAE 821149   Use of the Lamar Instrument test
equipment to develop turbocharger design.
--------------------------------------------

Paul Lamar

With that resume, can you explain why a 555 ; seems; is; VERY old tech.
Analogous to wanting a 7 transistor radio because it is simpler than the
latest AM radio which is a complete "AM/FM radio on a chip".
Yes it would be simple, but that is not really better, or even more
reliable.

briang

Not a good analogy. We are looking for something anyone
can fix with an ohm meter. If your computer is dead
where do you start?

The 555 system is modular. If one injector is not working
you can plug in and try a cheap ($20) module for just that injector
other than just trying another injector.

Paul Lamar



  >If your computer is dead where do you start?

I guess that is a rhetorical question; because with your resume I have
no doubt you know how to diagnose that!

I didn't know you were going to be able to manufacture modules for $20.
Nice.

brian g

Not much to them.

Paul Lamar

Some of you may get the impression we are going to equal the accuracy
and response of a full blown computer system with half a dozen input
sensors. Not true. We are looking for a low cost easy to fix aircraft
carb replacement that requires the pilot to adjust the mixture. No
throttle position sensor which is needed for high speed acceleration
response. No accelerator pump which many automotive carbs have but few
aircraft carbs have.

However here is a simple trick I thought of awhile back to enrich the
mixture  when you slam the throttle home for a go around.
It is a small air cylinder that sends a shot of air to the manifold
pressure sensor to trick it into thinking it is getting more air
than it really is. It will then send more fuel.  Of course on approach
you can set the mixture to full rich which you were trained to do anyway :)

The air cylinder is connected to the throttle cable.

Paul Lamar